Mostrando 7 resultados de: 7
Filtros aplicados
Subtipo de publicación
Article(7)
Publisher
Energy Sources, Part A: Recovery, Utilization and Environmental Effects(1)
Estudios Geologicos(1)
International Journal of Coal Geology(1)
Journal of South American Earth Sciences(1)
Organic Geochemistry(1)
Área temáticas
Geología económica(4)
Ciencias de la tierra(3)
Aceites, grasas, ceras y gases industriales(1)
Ciencias de la Tierra de América del Sur(1)
Geología, hidrología, meteorología(1)
Área de conocimiento
Geoquímica(5)
Química ambiental(4)
Química orgánica(2)
Ingeniería química(1)
Petrología(1)
Origen
scopus(7)
Effect of coal weathering on some geochemical parameters
ArticleAbstract: The effect of coal weathering on some geochemical parameters was studied. Seven pairs of fresh and aPalabras claves:Bitumen, Coal, floatability, geochemistry, humic substances, VENEZUELA, WeatheringAutores:Escobar M., Manuel MartínezFuentes:scopusEffect of temperature, oxidation time and substrate: Oxidant agent ratio in the yield and composition of humic acids derived from coal, monitored by <sup>1</sup>H NMR and FT-ir
ArticleAbstract: The yield and composition of coal-derived humic acids (AH) was studied, obtained by oxidation of a VPalabras claves:Coal, FT-ir, Humic acids, NMR, OXIDATION, WeatheringAutores:Contreras E., Leal E., Manuel MartínezFuentes:scopusDistribution of tiophenic organosulphur compounds in some venezuelan coals
ArticleAbstract: Some tiophenic organosulphur compounds (OSC) distribution in coal bitumen of four different localitiPalabras claves:Coal, Multivariate analysis, Organosulphur compounds (OSC), Sedimentary paleoenvironments, Thermal maturityAutores:Escobar M., Esteves I.H., González R., Manuel MartínezFuentes:scopusOrganic petrology of Paleocene Marcelina Formation coals, Paso Diablo mine, western Venezuela: Tectonic controls on coal type
ArticleAbstract: About 7 Mt of high volatile bituminous coal are produced annually from the four coal zones of the UpPalabras claves:Coal, Organic petrology, Paleocene, Paso Diablo mine, VENEZUELAAutores:Hackley P., Manuel MartínezFuentes:scopusTrace elements of Paleocene Táchira coals, Southwestern Venezuela: A geochemical study
ArticleAbstract: The concentration and distribution of 35 elements in 78 coal samples from the Táchira State coal fiePalabras claves:Coal, factor analysis, geochemistry, Trace elements, VENEZUELAAutores:Carmen Milena López, Escobar M., Esteves I.H., Galarraga F., González R., Manuel MartínezFuentes:scopusThe effects of sulfur on the weathering extent of carbon. A companson of two mines in Hato de la Virgin, State of Tachira, Venezuela
ArticleAbstract: Ten bituminous coal samples, showing several weathering levels, were collected at different depths iPalabras claves:Coal, geochemistry, OXIDATION, Sulfur, VENEZUELA, WeatheringAutores:Escobar M., Esteves I.H., Galarraga F., González R., Manuel MartínezFuentes:scopusTi/Zr ratio as a geochemical tool for the correlation of weathered coals from geological formations in two Latin American sedimentary basins
ArticleAbstract: Major and trace element concentrations in fresh and altered coals in outcrops and coalfields from TáPalabras claves:Coal, elemental ratio, inorganic geochemistry, seam correlation, weathering processesAutores:A. Álvarez, Érica Lorenzo, Escobar M., Fernando Morante-Carballo, Gonzalo Márquez, Manuel MartínezFuentes:scopus